Precision squeezer yoke



May 8, 1945.

H. s. slNEs 2,375,445

PRECISION SQUEEZER YOKE Filed D96. 8, 1943 Agl Jai D.

Patented May `8, 1945 s PRECISION SQUEEZER. YoKE Harvey S. Sines,Montebello, Calif.assignor to Consolidated Vultee Aircraft Corporation,San

Diego, Calif., a corporation of Delaware v Application December s, 194s,serial No. 513,414

' 9 claims. 01. 164-86) I The invention relates to pressure operatedtools.

Portable tools now in common use comprise a frame equipped with powermeans, such for example as a cylinder and a piston, for the operation issupported from a bracket in such a manner that any deilection of orbending in the bracket by the compression forces duringthe rivetingoperation will not vary the normal relationshipkbeby pressure of a ram rtool which is slidably g guided in the frame anda thrust-receivingbracket with a device, such as asocketdie, for lthe punch or anv anvilfor a riveting tool. In the operation of these devices,the compressionforces.

of the ram transmitted to the opposed thrustreceiving bracket, for thesocket die when metal is to be .pierced or the anvil when a rivet is tobe upset, frequently cause bending in or deflection of the bracket. Thisdeflection causes the relationship of the normally coaxial punching tool'and the socket to be changed, or angular variation between the normallyparallel opposed compression faces on the tool and the die or anvil.This results in lack of precision in punching or irregular upsetting inriveting and frequently results in injury to the ram.l In piercing holeswhere precision is necessaryI it is important-,Ito maintain parallelismof the opposed compression faces and the coaxial relation of the punchand socket or die in order to insure regularity and the true or desiredaxes of the holes punched -in the Work.

One object of the invention isto provide an improved tool of this typein which the power operated ram or tool-and the coactingthrust-receiving devices, such asv a 'socket or anvil, are rigidlyconnected by a yoke which is supported at the end of thethrust-receiving bracket and supports the ram at its other end so thatany bending in or deflection ofthe bracket, produced .by

Vpressure from the ram, will maintain the opposed compression faces innormally parallel,` or the punch Vand the socketdie in normally coaxial,relation.

Another object of the invention is to provide a precision yoke-structurewhich may be used as an attachment to the frames of power units.

Another object ofl the invention is` to provide a portable Apunchingdevicein which the'punch and socket-die are conjointly movable by arigid yoke so that their compression faces and axial relation Will bemaintained notwithstanding any deflection of or bending in thethrust-receiving` yoke-supporting bracket during the punching operation.

Another object of the invention is to provide a pressure operableriveting tool in which the v ram and the anvil are supported by a rigidyoke which is adapted to receive the Work and which tween the opposedcompressionfaces on the anvil and the ram. V I

Other objects of the invention will appear lfrom `the detaileddescription.

The invention consists in the several novel features hereinafter setforth and more particularly delined `byclaims at the conclusion hereof.

In the drawing: 4

Fig. 1 vis a side elevation of a power unit equipped with a deviceembodying the invention. l

Fig. 2 is a perspective, parts being brokenaway, of the supportingbracket which is attached to l the frame of the power unit and isprovided -with an arm for receiving thrust through a socket-die and theyoke for supporting the 'ramirom the thrust-receiving end of thesupporting bracket. Fig. 3 is a section taken on line 3-3 of Fig.` 1.Fig. 4 is a section taken on lined-4 ofFig. 1. Fig. 5 is a section takenon line 5-5 of Fig. 1. Fig; 6 is aside elevation of a modied form of theinvention.

IFig. 7 is a section taken on line 'l1-l rof Fig. 6.

The invention is exemplified in a portable unit which comprises a casingor frame I0 for power m'eans, such as a piston (not shown) operable bycompressed air in a cylinder II for operating a stem I2 which isslidablyl mounted in the frame I0 and adapted to shift a ram 29. Theunit also comprises a handle I3 and a throttle-lever I4 for manuallycontrolling the operation .of the power means for the operation vof thestem I2, all of which may be of any suitable construction. In Figs. l to5, the unit is exemplified as used for punching or piercing holes in aplate of metal and 'the ram 29 functions as apunching tool. l

A generally C-shapled bracket I6 is adapted to extend around or receivethe work, such as the plates to be punched or pierced and comprises anarm I6a on the side of the Work at whichthe power-means is located, andan arm Ib extended to the opposite side of the work, the arms .beingintegrallyconnected by the `bend between them. The arm IBais providedwith a groove Il for receiving a flange I6 which. is rigid or integralwith the frame II) and ybolts I9 extend through said ange and anextension on arm I6a of bracket, I6

for rigidly attaching said arm to the frame Ill' and supporting thebracket I6. Thefend of arm I6b functions as a thrust-receiving member,on the side opposite the power side.

A pair of generally C-shaped rigid yokes 2I are disposed at theoppositeA `sides of the` bracket I6, respectively. Each yoke comprises amember or arm 22 which extends `to the end of the thrustreceiving arm'I6b of bracket I6 and a member or am' 23 which extends to the power oropposite side of the work. The ends or yoke-menibers 22 are rigidlysecured by bolts 24 and dowel pins 25 tothe end of `arm I6". The armIb'thus functions toA support the yokes at the side opposite the'side ofthe work where the pressureis applied by the ram 29, from frame I at the'opposite lside of the work. A guide block 21 nts tion of which may varyin hardness, is 'sometimes between the ends of ryoke-members 23 and is nxedly secured to said members by rivets 28 or may be welded Athereto sothat the guide block and the ends' of yoke-members 22 willbe rig-l idlysecured together and the guide vblock will be supported throughthe yokesfrom the thrustreceiving end of yarm I6b of bracket I6. The ram29'lis-slidably mounted lin the guide block 21 for movement to `and fromthe thrust-receivingarm I'0. `A coil-spring 36 between the guide block21 and av head 3l on th'e ram is adapted to retract 'the V'ram after a'pressure-stroke. The ram 29, rguided-win the block 21 at the power,side'of the work,.is1supported by the yokes 2| which are supported fromthe thrust-receiving endof the arm vIlbfofbracket I6; Clearance isprovided, as at 32, between the inner sides of vyokes 2I and the outersides of vbracket I6. Clearance is. also provided,` vas at 33, between`the guide block 21 andthe adjacent edge of thewloracketl I6.

A socket-dieu is tted on the top face on the thrust-receiving end of thearm I6b of'brack-` et-I6, and comprisesa flange a which is adapted Anopening a2 eX- to abut fagainstfs'aid face 20. tends vertically throughthe arm vlI-(ib for the punch291which passes through the `socket in thedie -a which coacts with the punch to pierce a plate.. The socket in thedie a and the ram29,y which 'functions as a punch when used with asocket-die, are coaxial and' the compressionfaces F' Ilb by pressurefrom the pneumatically operable y stem A"I2 which is slidably mounted-in the frame 'of the :punch and the diea and between the lat- Yytei-and 'face 2B of arm vI6b are parallel. A characteristic of thisconstruction 'is "that the ram or tool 29 ispsuppor'ted vby the arms 23'of the rigidy yokes 2l which are 'xedly secured tothe thrustreceivingen 'd of the armlb of the bracket I6 and"the`socketdie 'is rigidlysupported by said end o'f said 'thrust-receiving arm, so that when thepressure exerted by the punch during la punching operationis suicien'tto produce a deection in the 'connecting bend between the arms ofthebracket I6, 'the socket-die and the punch will both be shifted togetherand the normal co'- f' axialf relation of the ypunch and the socket inthe die and the' parallelism ofthe compression faces onthe punch and onthe die will be maintained."j i, "i

In the use of the unit, it will be manually shifted, which may be 'doneby 'grasping thel `handle II3 vin one hand and they yokes 2l in theother hand,` to position'the work between the end of arm I6'D and theram. The pneumatic device will then be operated under control of leverI4 Vto impart a driving stroke rto the ram 29. The metal will be piercedbetween thel `compression facesgonthe ram and the 'socket-diej on theend ofthe thrust-receiving armi-6b. In practice itis desired to avoidexcessive weight in the squeezler yoke'in its entirety because ofthenecessity golf manually shifting it to and from'the work.v The forcerequired to pierce the metal, the composisufcient to cause they pressureagainst vthe end of the thrust-receiving arm IIiD to bend the brackf y,et I 6 between the arm IBb and the arm I 6a which shifted out ofparallelism with the'normal planeA of the compression face on the ram orso it will y, not be perpendicular to the prolongation of they normalposition of the'axis of the ram when the ramis supported in they arm I6aof bracket I6 or in the frame Ill. Whenthis bending occursin myconstruction, the yokes 2I, block 21 and the ram '29 will be conjointlyshifted or deilected,v

the parallelism .between the compression faces on the rain, and thesocket-die will be maintained and the axis of the ram will remainperpendicular to the compressionl faces on the die and the face `2E) onarm y`Iliby and coaxially aligned with the socket in the die a. The ramwill not be subjected tollinjuriousstessesand'. the stress ofcompression ci the metal at the point of Vpiercing will ybe`distributed, as desired betweenA thecompression 'facesnotwithstandingthe -bending'which has occurred in the "bracket 16,' and `,precision inthe holes in the workwill be achieved.

In Figs. 6 and '1, the 'invention is illustrated 7 for use in upsettingrivets.' Infthis formv of the invention, the vstem 3'4 o'f 2a rivet-set35 ts lin' the opening a2 in the thrust-receiving arm IIIb.Y

The set.has a fla-nge 'which 'abuts against :the L'top face 200i the armI6b; The rivet-setvis adapted te vhoni a rivet 36 which wil-.1 be upsetby the :ram I 29andis substituted 'for the socket-die a. In this'modication the compression faces loff-the rivet-set fand between therivet-set and arm I 6b, andthe compression tace on 'the ram or rivetingtool y-29 will be conjointly shiftedl ory deilec'tedto maintain 'theirnormal relationship `when vthe compression .forces are suc'ienttoproduce a bend' in 'the bracket libetween itsxarms, as .be-

`fore described. I- v y i Preferably, fdual yokes are provided forsupportingthe ramvfronifthe 'end of vtlie'thrust-receiving armto'insurefa'gainst transverse movement of the ram, but ithwill beIunderstood that in some instances 'a single Vyoke may sutce; f

.The yoke structure is adapted 'to-be attached to the frame of aportable powerunitfandmay be applied to `power.units asa -substitutefior brackets withoutfyokes. ,Y

' The invention also 'exemplifies which is adapted -Eor `different work,`suchas :piercing andriveting. The yoke structure is sime Y ple inconstructionfand efcient in operation,`

particularlyV where, as in aircraft; precision -is required in theworkperformed lvby 'the tools;r`

stricted tothe details setv forth, since thesefmay be modied within .thevvscope of' thev appended e claims' without departing from the.spirit'and Thefinvention is not to be understoodas rscope of theinvention.

' Having thus described the invention, what i 1 claim 'as'new and desire'tov secure by Letters Patentiszf L' l. The combination with a portableVframe,

4power operable means mounted in, and portably supported by the frame,for 'operation l atfone'side v of the work, a portable rsubstantiallyC'eshaped* :bracket havingl one of its members vconnected to ing memberonjthe opposite `side joff'th'e'lwork, "of, v

and supported by the frame and lathrust-receiva' yoke structure ing anend portion to which the thrustfrec'eiving member of the bracket isrigidly secured andav member extending to the power side of the work,and a ram operable by said power means for operation on the work andAportably supported by the member of the bracket on the power side of thework, the yoke beingadapted to support the ram for maintaining normalworking relation-w ship between the ram and the thrust-receiving memberof the bracket when `pressure lfrom `th ported .by the frame foroperation at one side of the work, a portable substantially `C-shapedbracket having one of its members connected to and supported by theframe and a-'thrust-receiving member on the opposite side of the work,'of a portable rigid yoke comprising a member' having an end portiontowhich the thrust-receiving member of the bracket is rigidly secured anda member extending to the power side of the work, and a portable ramoperable by said power means for operation on the work and slidablysupported in the member of the bracket on the power side of the work,the yoke being adapted to support the ram'for maintaining normal workingrelationship between the ram and the thrustreceiving member ofthe'bracket when pressure from the ram causes deection in the bracket.

3. The combination with a portable frame, power operable means mountedin 'and portably supported by the frame for operation at one side Aofthe work, a substantially C-shaped bracket Aformed of a single solidnarrow wall with flat side-faces, having one of its members connected toand portably supported by the frame and a thrust-receivingmember on theoposite side of the work of a portable yoke, having a pair of sides inclose relationship with the side-faces of the bracket, each comprising amemberhaving an end portion to which is rigidly secured thethrust-receiving member of the bracket and av member extending to thepower side'of the work,' and a portable ram operable by said powermeansfor operation cn the work and portably support-v ed by the member of thebracket on the power side of the work, the yoke being adapted to supportthe ram for maintaining normal working relationship between the ram andthe thrust-re ceiving member of the bracket when pressure" from the ramcauses deflection' in the bracket.

4. The combination with a portable frame, power operable stem mounted'inand portably supported by the frame for operation 'at one side of thework, a portable substantially C-shaped bracket formed of a singlenarrow solid wall with substantially `ilat side-faces, having one of itsmembers connected to and portably supported by the frame and athrust-receiving memberon the opposite side of the work, of a portablerigid yoke having a pair of sides in close relationship with theside-faces of the bracket, each side comprising a member having an endportion rigidly sev cured to the thrust-receiving member' of the Jmalworking relationship between the ram and the thrust-receiving member ofthe bracket when s Ka pressure from the ram--causesdeectionin thebracket.

5. .The combination with aportable frame, rpower operable stem slidablymounted inand portablysupported by the frame for operation at one sidevof the work, a portable substantially C-shaped bracket formed orr asingle narrow solid wall with substantially at side-faces, vhaving onebetween the ends of` the bracket-sides at their,v

of its members connected to and portably supported by the frame and athrust-receiving member on theopposite side of vthe work, of a portablerigid yoke havinga pair of sides in close relationship with theside-faces o'f the bracket,

each side comprising a mem-berhaving an end i ing normal workingrelationship between the stem Y and the thrust-receiving member ofthebracket when pressure from the ram causes deflection in the bracket, anda spring between the vram and the block for retracting the ram.

6. The combination with a portable frame,`

power operable stem sldably mounted in and portably supported by theframefor operation at one side of the work, a portable substantiallyC-shaped bracket formed of a single narrow solid wall'with substantiallyflat side faces, hav- .Y ing one of its members connected' to and port-yably supported by the frame and a thrust-receiving member on theopposite side of the work, of a portable rigid yoke having a pair ofsides 'in close relationship with the side-faces of the bracket',

each comprising a member having an end portion rigidly secured to thethrustreceiving member of the bracket and a member `extending t'o thepower side of the work, a block Xedly secured ends on the power side ofthe work, and 'a riveting tool slidable in and extending through saidblock and operable by said stem for operation on the work, and an anvilcarried by the end of the thrust-receiving member of the bracket, theyoke f being adapted to support the ram for maintaining normal workingrelationbetween the ram and the thrust-receiving member of the bracketwhen' `members provided with means vfor detacl'lablyv connecting it toand supporting it from the frame;

and an integral thrust-receiving member on the opposite side of thework, a substantially C- shaped portable yoke comprising sides in closerelation to the bracket, each side having a member with an end portionto which the `thrustreceiving member of the bracket is rigidly securedanda memberextending to the power side of the bracket, a tool slidablymounted between yoke being adapted to support the tool for maintainingnormal work relationship between the tool and the die when pressure fromthe tool causes deflection in the bracket.

8. A unit for attachment to a portable framev carrying power meanscomprising a portable sub-y stanti'aiiy G-'shaped :soid narrowbracketd'iav'ng one of its members detachably connectabexto :ama-E45istantiailygmshapedbracket havinga .solid nar- Yand;adaptedto beportabiysuppo'ntedjby the iframe', andan vintegral thrustereceivingmembermounted in thefblook for operation by the power Y' `means a springlfbetJV-een the tool Aand the block for'retracting the toolandaco-"acting die fcarrie'd'fby the, end fof the member fof the' bracketjat the thrust side of the work, the yoke being3.61am-k edv toisupportthe' .tool for maintaining normal work relationshipbemeen the tool anni'tn-'e die whenepifessurefrorn'the `tool causes ide'e'o'tionin" thebracket. 'l

. "9. Anzinit 1'at-i;achment to "aipontable frame oarryingrpowermeansinomfprising :a portabi'efsnb- 4tionioy the power means, arsprin-g@betwee'n the took-and the block for fretracti-n'g the tool;yand i cIrectaoie to and adapted to be'fpoitabiyrsupported 1 .by theframe, and an integral thrust-receiving mem-heron the lopposite' `sidefof thefwork, va Isubstantially` C-shapedl porta-101e 'yoke comprisingks ,iiies in'ciose relation to the sides of the bracket, 1

each yIsideV hav-ing agmember; with( an fend portion towhichihethrust-receiving 'mem-ber Vof `the binaoket is rigidly secured andamember extending to the power side y'of Vthe ubra-aliena block fixed Atothe lthrust ends between the-yokesidea-a riveting-tool slid'abiymountedinthe .block for 'operar an1=anvi1 rcarried by thefend of themembenfthebracket at the thrust .side ofthe, Aworlg'xthe yoke vbeing adapted tofsppoit the tool for main taining normal work `relationship between 'theool andthe anvil when pressure, rompthe-gtool causs deiectioninthebracket.; i

. v .f HARVEY S. VSINESL-

